donation. 1  an act or instance of presenting something as a gift, grant, or contribution. 2  a gift, as to a fund; contribution.
A black or brown tongue typically is due to the overgrowth of bacteria that normally are present on the tongue. This, too, can be caused by the killing of some bacteria with antibiotics so other bacteria overgrow. But the most common cause of discoloration of the tongue is the overgrowth of a fungus. The most common fungus is called candida. But overgrowth of the candida fungus turns the tongue white. Infection with candida is called candidiasis, and when it happens on the tongue the condition is called thrush.
It may happen slowly, but you canât help but notice a black, âhairyâ patch forming on your tongue. In fact, itâs so alarming that youâll have to ask yourself: What causes black tongue? Although the condition is âunsightly,â it is not harmful, the U.S. National Library of Medicine notes.